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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
How is it that the solution with arrays is 4 times faster best practice?
This comment is hidden because it contains spoiler information about the solution
It's a mathematical phenomenon that we don't have to know.
The most concise version!